What is "phototheodolite"

Phototheodolite \Pho`to*the*od"o*lite\, n. An arrangement of two photographic cameras, the plates of which may be brought into exactly the same plane, used in surveying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

n. 1 A theodolite with an attached camera. 2 An arrangement of two cameras, whose plates may be brought into exactly the same plane, used in surveying and map-making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.